Plug



FIG. 1 is a perspective view of a plug according to the present invention;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is a rear view thereof.

The broken lines in the drawing views are included for the purpose of illustrating environment and form no part of the claimed design. 

CLAIM The ornamental design for a plug, as shown and described. 